Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Winmail.dat Opener: Pro Reader
tired of "free" apps that hide features behind $49.99 subscriptions? or old tools that can't open xps documents?
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Winmail.dat Opener: Pro Reader: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Implement better file format detection and user guidance.
Assumption to check: Difficulty opening winmail.dat files if the app fails to recognize the format.
Validate with people who use this workflow before building.
Hypothesis 2
Provide more sharing methods and integrations with popular apps.
Assumption to check: Limited sharing options for the file content.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize file handling for larger files.
Assumption to check: No support for large winmail.dat files may lead to crashes.
Validate with people who use this workflow before building.
Hypothesis 4
Include a comprehensive help section and customer support integration.
Assumption to check: Lack of user support options for troubleshooting.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
tired of "free" apps that hide features behind $49.99 subscriptions? or old tools that can't open xps documents? winmail.dat opener 2026 is the all-in-one solution for business professionals. it safely unpacks outlook winmail.dat (tnef) and .msg attachments and also works as a powerful xps/oxps viewer for iphone and ipad. why choose us? - xps & oxps viewer: open xml paper specification files directly, no extra converters. - no subscriptions: one-time purchase of $0.99. own it forever. - privacy first: 100% on-device processing. your contracts and invoices never leave your phone. - 2026 optimized: built for the latest ios, supporting dark mode and drag & drop. - universal extractor: save photos, pdfs, word, and excel files from .dat files. - multilingual support upgraded and optimized. supported formats - winmail.dat (tnef) - outlook message (.msg) - xps documents (.xps) - openxps documents (.oxps) how to use 1. open your mail app or files app. 2. tap the attachment (winmail.dat or file.xps). 3. select "share" and choose this app. 4. view, print, or save your document instantly. we update regularly. if you have any issues, contact us at [email protected].
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
@react-navigation/native
expo-file-system
react-native-clipboard
zustand
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
